Add new configuration loading path for apex module Cronet

Add an additional loading path which is used for libs permission
xml providing from Cronet apex module.

Bug: 145474221
Bug: 139397529
Test: build
Test: manual test with Cronet
Change-Id: I103539a45fe9182f84a79bfe45a6172d94068690
Merged-In: I02541eb2d4808d69ab8cb2d6a48cf8aaa39c86dc